Thanks for all the words of encouragement.
Well we had the meeting.
They said that to do Extended + AS you should be an A grade GCSE person, that has been their policy for 3 years. (Why did nobody ever say this clearly when we went to open evening, when DD applied, when DD enrolled??).
She is doing fine in her AS, and in the lessons. But they showed us an example of what she has submitted and someone else's. A world apart.
. Also not mixing too well with the others. 

.
They said she would be bored in the level 2 course. (Thank you for suggesting I asked about that though).
We agreed she needs to switch to the standard diploma.
We asked that she is given opportunity to talk through what she needs to refer to and write to meet requirements and that skills development focus attention on helping her identify what she needs to do.
I am also going to need to be more hands on short term
to try to make sure her assignments meet criteria.
DD isn't overjoyed, but we told her its our/colleges fault for signing her up to something she isn't 'qualified' for. But she is pleased she keeps the AS.
And more space in the timetable will mean less pressure, more time to do extra work on the AS, or extra curricular stuff, or to find someone to explain assignments to her etc.
I don't feel at all confident yet, so we shall see.